Pump on a dump trailer

[rockyridgefarm]

Hey all,

I just bought a Dandy Dump 5X8 trailer in really good condition but it has a bad 12 volt pump and motor. I"ve been lookin" at new Haldex 12v pump setups and can"t swing the $350 to buy one. While looking at used ones on ebay, I came across several hand pump units for under $100 like the one in my link. Would this work, and, more important, am I gonna be pumping it 500 times to dump the trailer?

Thanks for any input.

 

[Paul from MI]

Calculate it like this.
Measure bore and stroke of cylinder on the trailer. Calculate cylinder volume(dia/2 squared x stroke)
Most hand pumps have a volume per stroke marked on them or in the literature for the pump. If not you may get it from the manufacturer.
Divide cylinder volume by volume per stroke, this will give you the number of strokes required. Actual may be a little more due to pump efficiency, etc.
Hope you can understand the volume formula-I don't know how to write it on a computer. Of course if you ahve a two stage pump this calculation won't work very well.
Good luck,
Paul

 

[Sid]

You gonna be doing a lotta pumping.

 

[glennster]

those pumps are for a porta power, we use em at the body shop, usually 10 ton pumps. they barely hold a quart of hydraulic oil, and will move a small cylinder maybe 1/8 inch with each stroke. if your dump trailer has any size cylinder at all, you will run out of oil in the pump real quick.

 

[Anonymous-0]

Probably at least 500 times. A hand pump like the one shown is probably good for 10,000 psi. I have seen them used on an implement cylinder but it would be very slow. The more pressure it needs, the harder to pump. You also risk blowing seals out of lower pressure cylinder. Your best with a 12 volt pump or engine driven pump. Dave

 

[rockyridgefarm]

Hi All,

Thanks for all the input. The Greenlee 767 looked promising but it looks like they consistently sell for over $150. According to Paul's calculations, my 3X16 cylinder has 36 cu in of oil capacity. The Greenlee pumped at .82 cu in/stroke. By those numbers, it would supposedly fill the cylinder in 45 strokes. I never could find reservoir capacity but it looks a bit short on that front. I wonder how much force I would need to operate the pump...

I think I'll keep up the search for a 12 volt unit as suggested. Any good idea on where to find a good, used one? I've seen some out of lift gates off the back of trucks from Texas on Ebay.

 

[RobMD]

you'll need to start lifting weights on your left arm to compensate for your massive right arm.

 

[Anonymous-0]

Look for NORTHERN HY as they have them mine on my trailer pumps both ways on each stroke and lifts up my tractors easy and fast no need for a res. If it can lift a 2500# tractor on the front of a 18ft bed it sill sure lift what you need

 

[Jaden]

Paul;
I believe you forgot to include pi (3.14) in your calculation.
John

 

[Leland]

look for a pump and motor from a old snow plow .